<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="lib/vue.global.js"></script>
</head>
<body>
    <div id="root">
        {{ title }}
        <my-header></my-header>
        <my-footer></my-footer>
    </div>
</body>
<script>
    const { createApp } = window.Vue
    const myHeader = {
        template: '<header>header</header>'
    }
    const app = createApp({
        components: {
            'my-header': myHeader
        },
        data () {
        return {
            title: 'hi'
        }
        }
    })
    app.component('my-footer', {
        template: '<footer>footer</footer>'
    })
    app.mount('#root')
</script>
</html>